of alliance



T. F. BAILY AND F. T. COPE.

HEAT TREATING AND QUENCHING DEVICE.

APPLICATION FILED AUG,I2, I918.

Patented Nov. 25,1919.

tion that the'first part of the changes in the form, proportions;

THADDEUS F. DAILY AND FRANK 'r. Corn,

CF ALLIANCE, OHIO, ASSIGNORS TO THE ELECTRIC FURNACE COMPANY, OF ALLIANCE, OHIO, A CORPORATION OF OHIO.*

HEAT-TREATING AN D QUENCHING DEVICE.

Specification of Letters Patent.

Patented Nov. 25, 1919.

Application filed August 12, 1918 Serial No. 249,507.

To all whom/it may concern:

Be it known that we, THADDEUS F. BAILY and FRANK T. Corn, citizens of the United States, both residing at Alliance, in the county of Stark and State of Ohio, have invented a new and useful Heat-Treating and Quenching Device, of which the following is a specification.

This invention relates to heat treating and quenching devices to be used in the heat treating process of metal articles of relatively great length and small diameter, the object being to effect a structure in which the heated article on being removed from the furnace can be immediately plunged into the quenching tank, thereby eliminating any loss of time.

Another object is to construct a device of this character to handle elongated metal articles to be heat treated such as gun tubes for large caliber ordnance and the like, without the necessity room above the furnace.

Another object is the arrangement of the furnace and quenching tank in such rela heated article to emerge from the furnace will be the first part of the said article to enter the quenching tank.

With these objects in view the invention consists in the novel construction and arrangement of parts, hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various s ze an minor details of construction maybe made within the scope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the invention. The drawing illustrates a sectional view taken vertically through our-device.

At 1 is shown an electric furnace of the resistance type, the resistance troughs carrying the heating element being shown at 2.

While a furnace of any desired shape in cross section can be employed, we have illustrated a cylindrical type of furnace, the rep sistance troughs being circular and extending about the interior walls of the furnace. It will be'noted that the troughs are shown as being spaced, one above the other. Since a much taller furnace is necessary for the particular of work to be handled the of providing headresistance troughs the furnace in such a way that any distributionof heat will sired. A frame work nel bars 3 supports the furnace and mounted upon this framework and above the said furnace is a grooved roller or pulley 4, and at one side of the framework is a similar pulley 5. In vertical alinement beneath the pulley 5 is a drum 6 which is arrange to be driven by suitable gearing 7 and a chain or flexible cable 8 is wrapped about the drum 6 and passing. upwardly runs over the pulleys 5 and 4. The point where the cable or chain leaves the inner edge of the pulley 4 is in exact alinement with the vertical center line of the furnace. An opening is formed in the extreme top of the center of the furnace and through this opening the chain or cable '8 is designed to pass to the interior of the furnace. A hook 9 is secured to the extremity of the chain withinthe furnace. This hook is designed to receive the bail 10 of a clamping member 11, in which clamping member the article to be heated, such as the gun tube shown at 12, is supported. 7 In an exact vertical line beneath the hook 9, an opening 14 is formed in the bottom or floor of the furnace chamber and a door 15 is provided as a closure to the said opening.

Arranged beneath the furnace is a tank 16 which is filled with water, oil, chemical solution or the like, suitable for the quenching of the heated article as it is remov from the furnace. Rails 17, bridge across the top of the quenching tank and form a track for a truck 18. This truck is arranged to roll u on the said track and has formed through its central portion a vertical opening 19 through-which the article formed of steel chanemergingfrom the furnace is. designed to pass. The quenching tank is arranged so that approximately one-half of its length.

lies beneath the furnace, the remaining portion being disposed to one side of the said furnace, as shown.

In the operation of our device the gun tube or other article to be heated is carried to a' point to one side of the furnace and in a vertical line above thecxposed portion of the tank. An overhead traveling crane, such as is indicated at A in the drawings is used for this purpose. The truck 18 is now moved to a position directly beneath the may be arranged withinbe'efiected that is de-,

ed to neath the olpening 14 in the bottom of the furnace. he driving mechanism 7 connected to the drum 6 is then operated to lower the chain or cable, the door 15 is swung open allowing the hook 9 to pass through until it can be secured into the bail 10 upon the gun. The drum 6 is then released winding in the cable 8 and hoisting the gun to the position illustrated within the furnace. The door is then closed and the heat treating of the article begun. When the heat of the article being treated 'has reached an exact predetermined point the door 15 is again opened and the drum 6 rotated to lower the gun into the quenching tank, The truck 18 has meanwhile remained in the position which it occupied. when the gun was hoisted into the furnace, so as the gun descends into the quenching tankfrom the furnace it passes again through the opening 19 in the truck, the projections 20 supporting it as before. The hook 9 is now disengaged from the bail and the truck moved over to position beneath the overhead crane. When the gun tube has cooled sufficiently the hook from the crane is again lowered, secured in the bail 10 and the gun is removed from the quenching tank.

From the foregoing description it will be obvious that with the use of our device a great many objegtionable features now common in the heat treatment of such articles as are herein described, are obviated. Common practice in the arrangement of furnaces and quenching baths heretofore for this class of articles was to place the furnace and quenching tank both upon the same level so that the article after eing heated was re- -1noved through the top of the furnace, the 'door or'opening for this purpose of course being located at the extreme top of the furnace chamber. This necessitates suffi'cient overhead room being left above the furnace to draw the article out its entire length by a crane. It also results in the portion of the article being treated which leaves the furnace last being the first portion to enter the quenching tank, thus the first por tion which emerges is the last to enter the quenching tank and since the exact tempera-, ture is necessary .it is a difficult, if not an imposs ble matter to produce thebest results. The location of Lateral extensions said track to a for perfect heat treating,

the opening at the top of the furnace also results in a considerable amount of heat being lost while the article is being placed in and removed from the furnace chamber.

While we have shown and described our device in connection with the heat treatment of gun tubes it is obvious that any article of neath the furnace and extending to one side thereof and designed to receive articles to be heat treated within the furnace, a horizontal track located abovethe tank and beneath the furnace, means for conveying articles upon point beneath the opening in the furnace, means for raising the articles through" the opening into the interior of the furnace and for discharging the articles after being heated from the furnace into the tank and means for supporting the articles upon thetrack when they are suspended within the tank.

2. A furnace provided with an opening at its lower ends, neath the furnace and extending to one side thereof and designed to receive articles to be heat treated Within the furnace, a horizontal track located above the tank-and beneath the furnace, a truck mounted upon the track and arranged to carry articles to be heat treated, means for raising the articles through *thmpening and into the interior of the furnace and for discharging the articles after being heated from the furnace into the a quenching tank located betank and for .supporting the articles upon the truck'when they are suspended within the tank.f== l v 3. A furnace provided with an opening at its lower end, a quenching tank located beneath the furnace and extending to one side thereof and desi ed to receive articles to be heat treated within the furnace, a truck movable horizontally above the tank and beneath the furnace and arranged to convey articles to be heated to a point beneath theopening in the furnace, means for raising the articles from the truck through the opening into the interiorof the furnace and for discharging the articles after being heated from the furnace into the tank and means for su porting the articles u on the truck when eyare suspended wit in the tank. I

In testimony that we claim the above, we

have hereunto subscribed our names.

THADDEUS F. BAILY.

- FRANK T.. COPE. 

